Remove string dupe exploit setting (#502)

Author: Leguan16

config-specs/paper/paper-global.yml

@@ -449,11 +449,6 @@ unsupported-settings:
       possible, for example sand duplication. This
       setting is not recommended to be enabled, but is provided for those who
       wish to use it.
-  allow-tripwire-disarming-exploits:
-    default: "false"
-    description: >-
-      Whether the server should allow tripwire disarming exploits. This allows
-      the duplication of string.
 watchdog:
   early-warning-delay:
     default: "10000"

config-specs/paper/vanilla/paper-global.yml

@@ -51,7 +51,5 @@ unsupported-settings:
     default: "true"
   allow-unsafe-end-portal-teleportation:
     default: "true"
-  allow-tripwire-disarming-exploits:
-    default: "true"
   perform-username-validation:
     default: "false"

docs/paper/admin/misc/paper-bug-fixes.md

@@ -43,14 +43,6 @@ unsupported-settings:
   allow-unsafe-end-portal-teleportation: true
 ```
 
-Similarly, we also allow you to enable string-based duplication bugs with the following config option:
-```yaml title="config/paper-global.yml"
-unsupported-settings:
-  allow-tripwire-disarming-exploits: true
-```
-This is a [long term bug](https://bugs.mojang.com/browse/MC-129055) that has not yet been fixed by Mojang. We have
-fixed it in Paper, but we provide a config option to restore Vanilla behavior.
-
 ## Block breaking
 
 We also fix the ability to break Bedrock and End Portal frames. We do also provide a config option to restore this